Hello @sportceneter,
Upon logging I see that you are runing the latest RC version of Pro. Though there is no harm in running release candidate, but please note that RC can cause potential issues. It’s something that I wanted to share with you.
Next I opened few pages and can see conflict error. However, in browser console I see following error message:
Failed to load https://sport.center/public-skating/: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'https://staging1.sport.center' is therefore not allowed access.
https://screencast.com/t/StIUfnyI
I checked the site URl settings and it seems that the configuration is using the live URL. I also noticed that you are running the website on Siteground server. Cornerstone is using the Site URL and WordPress Address URL settings in Settings > General. Siteground does not allow you to change this. Perhaps you can resolve this by manually editing the wp-config.php file of the staging area and add this:
define('WP_HOME','https://staging1.sport.center/');
define('WP_SITEURL','https://staging1.sport.center/');
If you are not comfortable with codes, then please get in touch with Siteground and see if they can change the URL settings.
Next, there could me one more possibility and may be because of that you are seeing the issues with Pro builder. Please note that Siteground mod_security rules could preventing the content builder from working correctly. I suggest you to kindly get in touch with Siteground and get them to exclude all Pro assets from the mod_security ruleset.
Let us know how it goes.
Thanks.